Optimisation of FRP Strengthening Systems for Masonry Arch Bridges

Masonry arch bridges are some of the most common bridge forms in the world. While the majority of these structures are of considerable age, many perform a vital role today carrying roads, rail and services etc. Increased vehicular loads and material deterioration mean that strengthening of existing arches is often required in order to prolong service life. This study will investigate the application of strengthening techniques using fibre reinforced polymer (FRP) composite systems. The application will be explored via numerical modelling using the finite element software package ABAQUS 6.11. The numerical models have been validated with existing experimental test data and are then used to investigate the behaviour of semi-circular masonry arches strengthened with different configurations of FRP e.g. at the intrados, extrados or locally. Then, effects of configuration and amount of FRP on the ductility, strength and global behaviour of strengthened arches will be investigated. Each strengthening system will be compared in terms of increase in strength, ductility, cost and efficiency. Following this, the most efficient strengthening arrangement with the optimum amount of reinforcement will be identified